The atmosphere is mainly transparent to this form of ultraviolet radiation-
A. UV-B
B. UV-A
C. UV-C
Answer: B
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Would you expect the concentrations of air pollutants to vary significantly during the day in the city? If so, when would you expect to find the highest concentrations of pollutants?
The layer of the Sun that radiates most of the light that reaches Earth is called the ________
A) corona B) photosphere C) ionosphere D) chromosphere E) megasphere
What is the primary reason for the many hydrothermal features in Yellowstone National Park?
A. cool climate B. frequent earthquakes C. proximity to the oceans D. near-surface underground magma chamber E. high concentration of hot gases underground
The deepest trench in the world ocean is the:
1.Aleutian Trench. 2.Java Trench. 3.Mariana Trench. 4.Peru-Chile Trench.